<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
		<!--[if lt IE 9]>
    <script src="jquery-1.9.0.js"></script>
<![endif]-->
		<!--[if gte IE 9]><!-->
		<script src="../js/jquery-3.1.1.js"></script>
		<!--<![endif]-->
		<script type="text/javascript">
$(document).ready(function(){
  $(":disabled").css("background-color","red");
});
		</script>
	</head>

	<body>
<form action="">
用户名: <input type="text" name="user"><br>
ID:<input type="text" name="id" disabled="disabled">
年龄:
<select disabled="disabled">
<option>20-30</option>
<option>30-50</option>
<option>50+</option>
</select>
<input type="submit">
</form>
	</body>
</html>